Jeeserssweesers(for a lack of a better word), probability is confusing. 1. The problem statement, all variables and given/known data A family has three children, no twins or.. that same just with three. a| What is the chance that all the children are girls. 2. Relevant equations The chapter here shows the equtations P(a)+P(b)=P(a)xP(b), but my problem here maybe is that I don't find the use of that in this question. 3. The attempt at a solution This questions looks just like the same to me when you throw three coins and ask what the chance is for that you get three on one side(?). So I get 2(boy or girl)x2x2= 8 possible outcomes. And getting three on one side is one out of these 8 outcomes, same with getting three girls. So that gives: 1/8. (=0.125). But in my book the result shows 0.115.